Thank you for all your answers. The language I am trying to implement
is quite complex, unfortunately. It has various --and also optional--
block-like structures. Hence I personally would prefer setting the
context variable for the lexer, over rearranging the whole grammar just
for this nagging semicolon-rule. What I tried was following:
Block
: '{' Statements '}'
;
Statements
: Statement Semicolon
| Statements Statement Semicolon
;
Semicolon
: { driver.expect_semicolon = 1; } ';'
;
If expect_semicolon is set and the lexer reads a '}', it then will
unput this character and return a ';' instead. My problem is,
expect_semicolon is set _after_ the next is already read and the
';'-injection is too late. What am I missing?
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